| Drought resistance identification and drought resistance index screening of sunflower germplasm resources at seedling stage |
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| DOI：10.7606/j.issn.1000-7601.2021.04.29 |
| Key Words: sunflower germplasm seedling stage drought resistance drought resistance index |
| Author Name | Affiliation | | ZHEN Zilong | Institute of Agriculture, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010000, China | | HOU Jianhua | Institute of Agriculture, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010000, China | | YI Liuxi | Institute of Agriculture, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010000, China | | YU HaiFeng | Inner Mongolia Academy of Agriculture and Animal Husbandry sciences, Hohhot, Inner Mongolia 010031, China | | SHI Huimin | Institute of Agriculture, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010000, China | | WANG Jinglin | Institute of Agriculture, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010000, China | | WANG Yaru | Institute of Agriculture, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010000, China | | SU Feiyan | Institute of Agriculture, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010000, China | | WANG Yanxian | Institute of Agriculture, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010000, China |
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| Abstract: |
| This study used 226 sunflower germplasm resources as experimental materials. Two treatments of pot experiment were with normal irrigation and drought stress. Plant height, leaf area per plant, SPAD value, leaf relative water content,root length,root volume,root cap ratio index and root surface areawere recorded to calculate the comprehensive evaluation value and drought\|resistant coefficient (D value) andconduct correlation analysis, linear regression analysis as well as identify seedling index of drought resistance.The results showed that the significant correlations were found amongthe eight drought resistance indexes. Additionally, there was a significant correlation or correlation between the 8 indexes and the comprehensive evaluation D value, indicfating that all the eight traits could be used as evaluation indexes of drought resistance of sunflower at seedling stage. Multiple stepwise regression analysis established an equation that could preliminarily predict drought resistance of sunflower. Based on the comprehensive drought resistance ability (D value), germplasm resources were divided into five different drought resistance levels（strong drought\|tolerant type, drought\|tolerant type,normal type,drought\|sensitive typeand highly drought\|sensitive type）. Of which the extremely drought\|tolerant and drought\|tolerant types（175, 106, 117,117,161,132,162, 194,174,127,15, 110,133, 224,109,120）can be used as the main reference materials for sunflower breeding in the future. |
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